06 Cherokee, HEMI, Rear end noise?
I have a 06 Grand Cherokee Limited, HEMI, QDII. I am experiencing a whine coming from the rear when I am on the accelerator. Noise is only present when it is under a load, let off the gas and coast the noise goes away. Shop I took it to started with the pinion bearings in the rear diff., no change. Did find some "tight" spots in the u-joints on rear shaft, sent the shaft to the driveline shop and had shaft balanced and it checked ok. Removed the complete rearend and sent it to driveline shop and had everything gone thru, ring and pinion mesh pattern and backlash and so forth, shop said everything fine. Replaced front driveshaft, Have put close to 5k miles since all that work and problem still there. Called driveline shop again and they stated another Cherokee had come in with the same symptoms. They balanced the rear shaft on that one and said it checked fine also, but admitted that there machine does not check balance while the shaft is under a "load". My thinking is that since the noise is only produced while under a "load" that the problem is with the rear drive shaft. I have done a lot of research on the web and this seems to be a common problem, but I have not yet found where someone has found a cause for or a solution to this problem. Can someone please point me in the right direction. Thank you.